Your login screen you mean. In an earlier bug, you could just type your password in that empty box, press ENTER key and you were logged in. Give it a try to see if that works…
I guess you are on Gnome, so, if the above doesn t work, you could switch from the Antergos default lightdm to the Gnome s` GDM…
Install it with

Thank you for your answer !! No, I tried to type my password everywhere but it doesn’t work. So thank you for gdm it work perfectly with it. And I think it’s even better with gdm than lightdm. So thank you !

It is not a matter of right or wrong, but one of choice, preference, hardware compatibility.
Some hardware have issues, needing some digging.
Others want the default DM of their DE.
The use of Gnome Wayland
The fact that you need to work with your computer and there is no time to wait for the Antergos devs to fix the broken Antergos configuration (not their fault of course)…
Linux is fun because it gives you choices. Was I wrong to have my system set in a way that was not affected by the recent massive upgrade while still running “my own” Antergos?

No no, your solution was for the short run absolutely right. I did it the same way But perhaps now someone find this post after the guys of lightdm did fixed it already, so they don’t need to change to e.g. gdm, they only need to get the newest updates In this thread there is no hint, that the real cause of this was the broken updates (and here it was the package lightdm-webkit2-greeter).